Saw-filer&#39;s gauge



Jam, l, QBL J, T, RDLE 1,788,744

sAw FILERS GAUGE Filed D60. 10, 1929 LA ATTORNEY.

Patented Jan. 13, 1931.

UNETED srarss y V.Torna TURNER RID-DLE, oF LAWRENCE TOWNSHIP, wHATcoivf coUN'rY, WASHINGTON SAW-FILEBJS .Graneny Application filed December k10, 1929. Y Sera1No.413,04i3.n

My invention relates to improvements in saw-filers gauges used when standardizing' e the shape of saw teeth by filing the Vsame an 5 ardize the bits of the raker teeth of cross-cutY has for an object to provide a gauge to standy saws.

Another object of my improvement is to provide a gauge block suitable for attachment to the ordinary saw-tooth gauge Wherek'to both the outerv and inner edges of the bits y of ralrer teeth may quickly be filed to standard shape by filers of ordinary ability.

I attainy these and other objects of my im-V provement with the device illustratedin the accompanying sheet of drawings forming a part of this specification in which Figure 1 is` ASimilar characters indicate similar partsv throughout. Certain parts are broken away V.to show other parts hidden thereby.

y Vith more particular reference to the designated parts: y

In general, the body of the usual saw-tooth Vgauge is, in shape, an angle bark consisting of web 5 and flange 6. vMidway of the length of fiange 6 is an opening 7 which also encroaches on the upper part of web 5. Gauge block 8 is fastened to the lower side of flange 6, to bridge opening 7 therein, by screws 14 and 15. Grauge block 8 has perpendicular slot 11 therethrough extending the entire-length yof opening 7. A transverse notch 9 extends across the upper surface a8 of block 8 at the yright-hand end of opening 7 having a bottom surface 9 inclined-downwardly toward the right and a shallow left-hand wall 10 used as a stop. Stop Vscrew 12 lis engageable in a horizontal tapped .hole through the righthand endof bloclr entering slot 11. Block 8 is fastened beneath flange 6 with shims 13 intervening. These shims may be varied in thicknessor number and determine the disl' tance between the cutting edgeof theraker teeth and the line of the points of the cuti Bit 1C of lraker toothBon sawA to Y gauge ting teeth of the saws sharpened to this gauge. ln Fig. 4- a portion of a cross-entsaw A is shown 1n broken outline in place infmy gauge to have a bit C of. raker tooth B, B shaped to gauge. Said raker tooth has beenextended into slot 11 from below and placedY with its vright-hand edge a-gainstistop screw 12 and the points of its cutting teeth` Dagainst .the

bottoml wall of flange 6.* fBlockfS is preferably made of tempered steel andafliledoesf not Vengage with 'and-:score its surfaces.

rleeth D, it is assumed, have been sharpcned, thus 'reducing their length before the worklunder description was begun. .e y Y. is shown in `dotted outline l"protruding lslightly be'- yond the top surface z8 of block 8. Bit'C ofV said tooth B'alsorvr had' appeared above ythe gauge block but, .itis assumed 'that .it has been reduced `to surface therewith 'by having block surface o8. Then to finish sharpening and shaping bit C a three-cornered file shown in dotted outline at E is placed flatwise on notch bottom 9 and the Vinner edge of zo been filed off Vtill the file bore fiatwise on bit C is filed away while file Ebears on the bottom of notch9 tillna cornery of said file, E bears on stop wall 1() when said bit C is sharpened and shaped to standard. n

ln theV illustration the surface made by file E is at an angle ofj450 withthe vaxis of the tooth because' gauge surface 9 is at an anglev of o with said tooth'aXisand a cross section of ,file E is equiangular.` If another angularity of the bit be desired, a. different angled file or ablock with surface 9 at adiiferent kangle may be used. f

/Vhen thus finished, raker ard shape. y Y

To properly sharpen and-shape bit 1C the saw is turned end for end and raker B, Bis again extended through slot 11 and caused to bear. aga-inst stop screw 12 while the points of the cutting teethare caused to bear on the bit is oflstandlower surface ,of flange In practice, gof' course, saw Afisheld in a viseand the'saw gauge is reversed on the saw when changing tion.

a bit facing'in the opposite direcn' Y Whenthusreseabnicis mea naam-.a 10 a in the same manner as above described in reference to bit C.

Thus, by the use of my extremely simple gauge the bits of the raker teeth can be Abrought to a uniformity by an unskilled filer hitherto hardly attained by one most skilled.

The angularity of notch surface 9, the thickness of shims 13 and the angularity of the file used provide ample opportunity to suit my gauge to any requirement of raker bit shape.

It is readily apparent that my gauge block is easily fixed in place on the usual types of saw-tooth gauges. y

Having thus disclo-sed my invention, What I claim as new therein and desire to secure by Letters yPatent is,- Y

A saw-tooth gauge consisting of an angle bar the flange of which has an openV space therethrough midway the length thereof, a iilers gauge block fastened adjacent the inner Wall of said flange to bridge said open space and havinga longitudinal slot therethrough and a transverse notch intersecting said slot in the surface of said block adjacent said Harige said notch having a shallow edge Wall adaptedto stop a file and a downwardly inclined bottom Wall adapted to guide av file, shimsof suitable thickness intervening to space said block from said flange, said block having a tapped hole in the end thereof and a set screw extended through said hole to be disposed in said slot adjacent said notch to stop a raker tooth.

JOHN TURNER RIDDLE. 

